DD228295B1 - HALF-FLUID CONSISTENT LUBRICANT FOR SCREW GEAR, CONSTANTLY AGAINST IONIZING RADIATION - Google Patents

Description

Field of application of the invention

The invention relates to a semi-liquid consistent lubricant for worm gear, resistant to ionizing radiation, which ensures the lubrication of actuators for valves of the friction pair bronze / steel in nuclear power plants.

Characteristic of the known technical solutions

It is known that fluid grease for the lubrication of worm gears at high temperatures and simultaneous exposure to radiation are exposed to special stresses. Liquid fats based on soap thickener are destroyed under the action of radiation, as a result of which the consistency changes from semi-fluid to liquid and the lubricant flows out as a leak. Rapid wear and complete destruction of the power transmission elements in the transmission are the result. This poses a safety risk, especially in nuclear power plants. Although thickeners of the Bentonite and Aerosil type have radiation resistance, they are abrasive and prone to corrosion. From DE-AS 12 34 347 it is known that polymers tend to polymerize under the action of high-energy radiation, resulting in an increase in viscosity. From the product catalog of KdT, Part 1 "Lubricants and Special Products", Issue 1982, pages 224/225, a product based on synthetic oils, which were thickened by an organic consistency and encoders corrosion and oxidation inhibitors known.

Various synthetic oils, such as silicone, esters and polyalkylene oxides, are inferior to the hydrocarbons in radiation resistance and become too thick or even solid when exposed to high energy radiation in relatively small doses. Some oils, ζ. For example, the esters become highly acidic due to degradation.

Object of the invention

The aim of the invention is to provide semi-liquid consistent lubricants for worm gear, resistant to ionizing radiation that can be used with great reliability in nuclear power plants and can be produced technologically simple and inexpensive.

Object of the invention

The object of the invention is to provide semi-liquid consistent lubricants for worm gear, resistant to ionizing radiation, the lubrication of actuators for valves of the friction pair bronze / steel in the temperature range from -20 ° C to -100 ⁵ C, briefly up to 150 ° C a Radiation exposure up to 3,87 lO Ckg " ¹ Gamma radiation reliable over at least 40000 load cycles under the conditions of the nuclear power plant operation guarantee

Features of the invention

According to the invention, this object is achieved by a mixture of polyether alcohols with esterol, thickened with polyureas and provided with corrosion and oxidation inhibitors, characterized in that it consists of

93 to 88 Ma ·% polyether alcohol viscosity at 25 ° C from 200 to 400 m Pa-s and dialkyl phthalate, having 3 to 25 carbon atoms

in the alkyl radical, at a ratio of the components. 17 to 1S to 1, 1.5 to 2.5 wt .-% 4,4'-Düsocyanatodiphenylmethan, 2.5 to 4.5 Ma -% aminobenzene in admixture with primary aliphatic r / orcaikyiaminen the

Chain-length C ₄ to C ₂ i at a ratio of amino-acids to alkylamine of 1 to 8 to 9, 2.5 to 3.5% by weight of a barium sulfonate-based corrosion inhibitor, 0.5 to 1.5% by mass of diamine. tert-butyl-p-cresol

exists and is prepared in situ in a known manner. The interaction of the base liquid with the thickener ensures that no solidification of the lubricating composition occurs under extreme load with regard to the transmission of force in the region of high temperatures, and the excavation of the screw is precluded.

example

In a stirred vessel 860kg of a polyether alcohol, V ₆₀ = 100mm ^? / sund 50kg of a Dialkylphthlates, V ₂₀ = 35m Pa-s submitted.

With stirring, 3.5 kg of aminobenzene and 30 kg of a mixture of primary alkylamines of chain length C ₁₆ to C _{19 are} added. The mixture is heated to 60 ^c C and there are added 18.9 kg of 4,4'-Diisoxyanatodiphenylmethan.

After stirring for 30 minutes, 30 kg of a corrosion inhibitor based on barium sulfonate and 10 kg of di-tert-butyl-p-cresol are stirred in.

After cooling, the product is leveled using a colloid mill. The result is a white, semi-liquid consistent lubricant, which has the following characteristics:

Resting penetration: 456mm " ¹

Dropping point: 120 ° C

The characteristics of the apparent viscosity are given in the table.

table

Viscosities of the semi-liquid, consistent lubricant according to the invention before and after radiation exposure (3,87-ΙΟ ⁴⁰ " ⁹ " ¹ )

Apparent viscosity Product before irradiation 20 ° C 50 ⁰ C 0.34 0.13 7O ⁰ C Product after irradiation 20 ^° C. 50 ^° C. 0.53 0.33 0.13 70 ° C D = 300 s' ¹ D = IOV ¹ D = 10V ¹ 0.7 0.5 0.23 0.58 0.38 0.24 0.73 0.5 0.23 0.5 0.33 0.22

The measured values prove the high consistency stability of the product according to the invention under exposure to radiation.

Claims (2)

Semi-fluid consistent lubricant for worm gear, resistant to ionizing radiation, based on a mixture of polyether alcohols with esterol, thickened with polyureas and provided with corrosion and oxidation inhibitors, characterized in that it from 93 to 88 wt .-% polyether alcohol viscosity at 25 0C from 200 to 400 m Pa.s and dialkyl phthalate, having 3 to 25 C atoms in the alkyl radical, with a ratio of the components of 17 to 18 to 1, 1.5 to 2.5% by mass of 4,4'-diisocyanatodiphenylmethane,
2.5 to 4.5% by weight of aminobenzene in a mixture with primary aliphatic monoalkylamines of chain length C ₄ to C ₂ s at a ratio of aminobenzene to alkylamine of 1 to 8 to 9, 2.5 to 3.5 Ma.- ⁰ O of a corrosion inhibitor based on barium sulfonate, 0.5 to 1.5 Ma. % Di-tert-butyl-p.cresol
consists.